<!DOCTYPE html>
<html>
  <link rel='stylesheet' type='text/css' href='style.css'>
  <style>
    div.progress-bar {
      width:100%;
    }
    body > div:nth-child(1) > .progress-bar { width: 20px; }
    body > div:nth-child(2) > .progress-bar { width: 0px; }
    body > div:nth-child(3) > .progress-bar { width: 50%; }
    body > div:nth-child(4) > .progress-bar { width: 1em; }
    body > div:nth-child(5) > .progress-bar { width: 100%; }
  </style>
  <body>
    <div class="progress-element">
      <div class="progress-bar">
      </div>
    </div>
    <div class="progress-element">
      <div class="progress-bar">
      </div>
    </div>
    <div class="progress-element">
      <div class="progress-bar">
      </div>
    </div>
    <div class="progress-element">
      <div class="progress-bar">
      </div>
    </div>
    <div class="progress-element">
      <div class="progress-bar">
      </div>
    </div>
  </body>
</html>

